const env = require('./config.js');
const base64 = require('./base64.js');
const Crypto = require('./crypto.js');
const { formatDate } = require('../../utils/util.js');
require('./hmac.js');
require('./sha1.js');
/*
 *上传文件到阿里云oss
 *@param - filePath :图片的本地资源路径
  @param - path :上传oss哪个路径下
 *@param - successc:成功回调
 *@param - failc:失败回调
 */

const uploadFile = function(filePath, path, successc, failc) {
	if (!filePath || filePath.length < 9) {
		uni.showModal({
			title: '图片错误',
			content: '请重试',
			showCancel: false
		});
		return;
	}
	//存放图片命名格式：自定义时间戳给图片名字(可以自己改)
	const aliyunFileKey = path + `${formatDate(new Date())}/` + new Date().getTime() + Math.floor(Math.random() * 150) + '.png';
	const aliyunServerURL = env.uploadImageUrl; //OSS地址，https

	const accessid = env.OSSAccessKeyId;
	const policyBase64 = getPolicyBase64();
	const signature = getSignature(policyBase64);
	uni.uploadFile({
		url: aliyunServerURL, //开发者服务器 url
		filePath: filePath, //要上传文件资源的路径
		name: 'file', //必须填file
		formData: {
			key: aliyunFileKey,
			policy: policyBase64,
			OSSAccessKeyId: accessid,
			signature: signature,
			success_action_status: '200'
		},
		success: function(res) {
			if (res.statusCode != 200) {
				failc(new Error('上传错误:' + JSON.stringify(res)));
				return;
			}
			uni.showToast({ title: '上传成功！' })
			successc(aliyunServerURL + aliyunFileKey);
		},
		fail: function(err) {
			err.wxaddinfo = aliyunServerURL;
			failc(err);
		}
	});
};

const getPolicyBase64 = function() {
	let date = new Date();
	date.setHours(date.getHours() + env.timeout);
	let srcT = date.toISOString();
	const policyText = {
		expiration: srcT,
		//设置该Policy的失效时间，超过这个失效时间之后，就没有办法通过这个policy上传文件了
		conditions: [
            ['content-length-range', 0, 5 * 1024 * 1024] // 设置上传文件的大小限制,5mb
        ]
	};
	const policyBase64 = base64.encode(JSON.stringify(policyText));
	return policyBase64;
};

const getSignature = function(policyBase64) {
	const accesskey = env.AccessKeySecret;
	const bytes = Crypto.HMAC(Crypto.SHA1, policyBase64, accesskey, {
		asBytes: true
	});
	const signature = Crypto.util.bytesToBase64(bytes);
	return signature;
};

module.exports = uploadFile;